Sponge fauna of the New Siberian Shoal: biodiversity and some features of formation Author Morozov, Grigori Author Sabirov, Rushan Author Zimina, Olga text Journal of Natural History 2019 2019-01-08 52 47 2961 2992 journal article 24132 10.1080/00222933.2018.1554166 bd9add32-702b-495c-9ed7-7ed98fb4c591 1464-5262 3654165 FA2EDE40-93E0-43B7-9ACF-ECCE12B0E671 Craniella polyura ( Schmidt, 1870 ) ( Figure 13 (a – h)) Figure 13. Tetilla polyura : (a) habitus; (b–h) scanning electron microscope (SEM) images of spicules; (b) large oxea; (c) small oxea; (d) raphides; (e–e2) anatriaenes; (f) basal end of protriaene sagittal; (g, g1) normal protriaene; (h) sigma. Tetilla polyura Schmidt 1870 , p. 66 ; pl. VI, fig. 8 ; Vosmaer 1885, p. 9 – 10; pl. I, figs 1 – 3; pl. II, fig. 16; pl. V, figs 3 – 7 ; Breitfuss 1911 , p. 213 ; Rezvoi 1928, p. 76 ; Van Soest 2016 , p. 322, fig. 5a – g Description ( Figure 13 (a)). Sponge egg shaped, up to 4 cm in height and 2.5 cm in width. Surface even, slightly setose. The consistency is rather soft and elastic. Single conical osculum slightly displaced to the side from the summit. Comparatively long spicules protrude from the lower end of the body, forming a felt-like mass. Colour light brown. Two specimens examined. Skeleton Skeleton of radially spiral structure. Cortex absent. Spicules ( Figure 13 (a – h)). Large oxea, usually with unequal ends, dimensions: 1532.6 – 2904.5 – 4375.3 ( n = 20) × 11.7 – 28 – 42.3 ( n = 20) µm. Small oxea, slightly fusiform, with equal ends, dimensions: 556.5 – 776 – 1117.9 ( n = 30) × 6.2 – 17.6 – 29.4 ( n = 25) µm. Anatriaenes, rhabdome length up to 5 cm and thickness 4 – 4.5 – 5.2 ( n = 10) µm; cladome length: 64 – 74.7 – 86.3 ( n = 10) µm. Sagittal protriaenes, rhabdome length: 1073 – 1637.9 – 2575 ( n = 15) × 2.6 – 3.66 – 5.6 ( n = 15) µm; length of paired cladomes: 20.2 – 33.3 – 69.4 ( n = 15) µm; unpaired cladome length: 66.7 – 106.5 – 179.7 ( n = 15) µm. Normal protriaenes, rhabdome length: 510 – 617.8 – 931.7 ( n = 10) × 4.7 – 5.8 – 6.9 ( n = 10) µm; cladome length: 22 – 27.8 – 33.2 ( n = 10) µm. Raphides, dimensions: 192 – 347.7 – 473 ( n = 10) × 1 – 2 µm . Sigmas centrotylote, spined, dimensions: 9 – 12.7 – 16 ( n = 25) µm. Distribution Iceland . Barents, Kara, Laptev (st. A-102, L-12) and East Siberian seas (st. A-31). Depth range: 33 – 313 m .